Mordigan, thats BGII but I'll try to help. The key in question is gained in the Umar Hills. It has the stench of sewage. The mind flayers are tough. Send a mage to open the door ( maybe with something summoned with him/her)Cloudkill, shut door. For some reason this killed the umber hulks like that (snap) in my game. I didnt argue. Some flayers may follow you. Mage runs back to rest of party. Summoned monster(s) take the heat. Meanwhile summon another monster or two and ready missile weapons. If none followed do it again with haste spell, they'll follow you now. Use missile weapons until your summoned guys are dead, then melee weapons. The battle are tough yes but lots of exp.
Across the Bridge- Those are Gauth. Once again, cloudkill + summoned creature to bear the brunt. Have healing potions
Demon-try cure light wounds on the demon
Have more patience, you miss a lot of exp when you cheat across bridges etc by the way
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